scripts/boot/select-eth-device.sh

   1 #!/bin/sh
   2
   3 Select_eth_device ()
   4 {
   5         # Boot type in initramfs's config
   6         bootconf=$(egrep '^BOOT=' /conf/initramfs.conf | tail -1)
   7
   8         # can be superseded by command line (used by Debian-Live's netboot for example)
   9         for ARGUMENT in $(cat /proc/cmdline); do
  10                 case "${ARGUMENT}" in
  11                         netboot=*)
  12                                 NETBOOT="${ARGUMENT#netboot=}"
  13                                 ;;
  14                 esac
  15         done
  16
  17         if [ "$bootconf" != "BOOT=nfs" ] &&
  18            [ "$NETBOOT" = "" ] &&
  19            [ "$FETCH" = "" ] &&
  20            [ "$FTPFS" = "" ] &&
  21            [ "$HTTPFS" = "" ]
  22         then
  23             # Not a net boot : nothing to do
  24             return
  25         fi
  26
  27         # we want to do some basic IP
  28         modprobe -q af_packet
  29
  30         # Available Ethernet interfaces ?
  31         l_interfaces=""
  32         echo "Waiting for ethernet card(s) up... If this fails, maybe the ethernet card is not supported by the kernel `uname -r`?"
  33         while [ -z "$l_interfaces" ]; do
  34           l_interfaces="$(cd /sys/class/net/ && ls -d eth* 2>/dev/null)"
  35         done
  36
  37         if [ $(echo $l_interfaces | wc -w) -lt 2 ]; then
  38                 # only one interface : no choice
  39                 echo "DEVICE=$l_interfaces" >> /conf/param.conf
  40                 return
  41         fi
  42
  43         # If user force to use specific device, write it
  44         for ARGUMENT in $(cat /proc/cmdline); do
  45             case "${ARGUMENT}" in
  46                 live-netdev=*)
  47                 NETDEV="${ARGUMENT#live-netdev=}"
  48                 echo "DEVICE=$NETDEV" >> /conf/param.conf
  49                 echo "Found live-netdev parameter in /proc/cmdline. Force to use network device $NETDEV."
  50                 return
  51                 ;;
  52             esac
  53         done
  54
  55         found_eth_dev=""
  56         while true; do
  57                 echo -n "Looking for a connected Ethernet interface ..."
  58
  59                 for interface in $l_interfaces; do
  60                         # ATTR{carrier} is not set if this is not done
  61                         echo -n " $interface ?"
  62                         ipconfig -c none -d $interface -t 1 >/dev/null 2>&1
  63                 done
  64
  65                 echo ''
  66
  67                 for step in 1 2 3 4 5; do
  68                         for interface in $l_interfaces; do
  69                                 carrier=$(cat /sys/class/net/$interface/carrier \
  70                                         2>/dev/null)
  71                                 # link detected
  72                                 if [ "$carrier" = 1 ]; then
  73                                         echo "Connected $interface found"
  74                                         # inform initrd's init script :
  75                                         found_eth_dev="$found_eth_dev $interface"
  76                                 fi
  77                         done
  78                         if [ -n "$found_eth_dev" ]; then
  79                                 echo "DEVICE='$found_eth_dev'" >> /conf/param.conf
  80                                 return
  81                         else
  82                                 # wait a bit
  83                                 sleep 1
  84                         fi
  85                 done
  86         done
  87 }